There are 3 standard answers to solving the white-deposits-on -dishes problem: 1) Use a rinse aid; 2) use less detergent; 3) use vinegar in the washer. If you have hard water, none of these may work, especially if you've had the problem for a while. Because phosphates were ordered removed from dishwasher detergents, hard water minerals can now react with the soap to create a heavy greasy-feeling scum. That scum can build up in the water lines, arms, bottom reservoir, and filter, providing an endless supply of goo to spray on your dishes. This can be fixed. You need to remove and clean out the spray arms, the filters, and especially the array of parts at the bottom of the tub. I've seen up to 1 cup of coagulated/crystallized scum in the bottom of dishwasher tubs. Once you clean out the scum, then run the washer empty with a completely full detergent cup on the highest temperature setting, extra rinse. Before you start it add to the detergent cup 1 teaspoon of TSP(tri-sodium phosphate), a very powerful phosphate cleaner available at hardware stores. Your washer will now have all scum gone from the inner workings. From now on you must always fill both your detergent and pre-wash cups to the max and use a high temperature water setting, extra rinse. Chemically what you're trying to do is add so much detergent that the scum-forming reaction is overwhelmed by the dispersant action of the detergent, and the extra heat helps this to be more effective. I am not a fan of vinegar in the wash cycle. Why? In some washers the vinegar fumes can reach the exposed contacts of the printed circuit board or touch pad, corrode them, and then your washer won't work at all, along with being very expensive to fix.
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